Heat the vegetable oil in a large skillet over medium heat.
Add the diced onion and bell pepper to the skillet, sautéing until softened.
Stir in the minced garlic and Cajun seasoning, cooking for an additional minute.
Pour in the chicken broth and bring to a gentle simmer.
Stir in the rice and increase heat to medium-high, allowing the mixture to return to a boil.
Reduce heat to low, cover the skillet, and cook for 18-20 minutes.
Once the rice is cooked, fluff it with a fork and add the shrimp.
Cook for an additional 5-7 minutes until the shrimp are pink and opaque.
Season with salt and pepper, and garnish with sliced green onions.